The purpose of the present research is to establish a novel nanosizing technique starting from wet nano-milling, named "dry nanosuspension" technique for poorly water-soluble drugs. The spray freeze-drying (SFD) method was applied instead of the spray-drying one previously developed. Drug particles were milled in the aqueous solution of dispersing agents using an oscillating beads-milling apparatus. The milled nanosuspension was sprayed to the surface of liquid nitrogen, and the resultant iced droplets were freeze-dried to obtain the powdery product. The loading ratio of a dispersing agent was investigated to enhance its redispersing property. Dry nanosuspension, which could be spontaneously dispersed into original nanosuspension in water, was obtained by SFD process. It was assumed that self dispersion property would be attributed to its structure with porous network, in which the primary milled drug crystals were embedded. Such unique structure contributed greatly to immediate release behaviors of the drug in gastrointestinal buffered media. These pharmaceutical properties were enhanced by increasing the ratio of the dispersing agent to the drug and the solid content in suspension to be sprayed. The present technique via wet milling and spray freeze-drying processes would be a novel dissolution-enhanced technology for poorly water-soluble drugs.

译文

:本研究的目的是建立一种从湿法纳米研磨开始的新型纳米技术,该技术被称为“干纳米悬浮”技术,用于水溶性差的药物。应用喷雾冷冻干燥(SFD)方法代替先前开发的喷雾干燥方法。使用振荡珠磨设备在分散剂的水溶液中研磨药物颗粒。将研磨后的纳米悬浮液喷雾至液氮表面,并将所得的冰滴冷冻干燥,以获得粉状产物。为了提高分散剂的再分散性,对分散剂的负载率进行了研究。通过SFD工艺获得了可以自发分散在水中的纳米悬浮液的干燥纳米悬浮液。假定自分散性归因于其具有多孔网络的结构,其中嵌入了原始研磨的药物晶体。这种独特的结构极大地促进了药物在胃肠缓冲介质中的立即释放行为。通过增加分散剂与药物的比例和待喷雾悬浮液中的固体含量,可以提高这些药物的性能。通过湿磨和喷雾冷冻干燥方法的本技术将是用于水溶性差的药物的新型溶解增强技术。

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